Hit-Time and Hit-Position Reconstruction in Strips of Plastic Scintillators Using Multithreshold Readouts

Autor(en)

N. G. Sharma, M. Silarski, J. Chhokar, E. Czerwinski, C. Curceanu, K. Dulski, K. Farbaniec, A. Gajos, R. Del Grande, M. Gorgol, B. C. Hiesmayr, B. Jasinska, K. Kacprzak, L. Kaplon, D. Kisielewska, K. Klimaszewski, G. Korcyl, P. Kowalski, N. Krawczyk, W. Krzemien, T. Kozik, E. Kubicz, M. Mohammed, Sz Niedzwiecki, M. Palka, M. Pawlik-Niedzwiecka, L. Raczynski, J. Raj, S. Sharma, S. Shivani, R. Y. Shopa, M. Skurzok, W. Wislicki, B. Zgardzinska, P. Moskal

Abstrakt

In this article, a new method for the reconstruction of hit-position and hit-time of photons in long scintillator detectors is investigated. This article is motivated by the recent development of the positron emission tomography scanners based on plastic scintillators. The proposed method constitutes a new way of signal processing in multivoltage-technique. It is based on the determination of the degree of similarity between the registered signals and the synchronized model signals stored in a library. The library was established for a set of well-defined hit-positions along the length of the scintillator. The Mahalanobis distance was used as a measure of similarity between the two compared signals. The method was validated on the experimental data measured using two-strips J-PET prototype with dimensions of 5× 9× 300 mm3. The obtained time-of-flight (TOF) and spatial resolutions amount to 325 ps (FWHM) and 25 mm (FWHM), respectively. The TOF resolution was also compared to the results of an analogous study done using the linear fitting method. The best TOF resolution was obtained with this method at four predefined threshold levels which was comparable to the resolution achieved from the Mahalanobis distance at two predefined threshold levels. Although the algorithm of the linear fitting method is much simpler to apply than the Mahalanobis method, the application of the Mahalanobis distance requires a lower number of applied threshold levels and, hence, decreases the costs of electronics used in PET scanner.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Marie Curie-Sklodowska University, National Centre for Nuclear Research (NCBJ), University of Mosul, Jagiellonian University in Krakow, Istituto Nazionale di Fisica Nucleare (INFN), Roma

Journal

IEEE Transactions on Radiation and Plasma Medical Sciences

Band

4

Seiten

528-537

Anzahl der Seiten

10

ISSN

2469-7311

DOI

https://doi.org/10.1109/TRPMS.2020.2990621

Publikationsdatum

09-2020

Peer-reviewed

Ja

ÖFOS 2012

206003 Medizinische Physik, 302054 Nuklearmedizin

Schlagwörter

ASJC Scopus Sachgebiete

Instrumentation, Atomic and Molecular Physics, and Optics, Radiology Nuclear Medicine and imaging

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/d84db6fb-6a7f-4521-8f80-735470093a31